Maxon LO-NOX™ Line Burners Datasheet

Brand: Maxon

Model: LO-NOX™ Line Burners

Type: Datasheet

LO-NOX™ Line Burners Page 5803

3/92

Design and Application Details

Burner duct area displacement

For purposes of calculating operating air velocities

and resulting static pressure drops across the burner

assembly and profile plate, use the following equiva-

lent displacements:

Each 6" straight section: 0.35 ft2

Each 12" straight section: 0.7 ft2

Each 12" x 6" tee section: 0.75 ft2

Each 12" x 12" cross section: 0.85 ft2

For example:

A LO-NOX™ Line Burner assembly is made up of:

(2) 12" straight sections @ 0.7 ft2 displ. area

(1) 12" back inlet straight @ 0.7 ft2 displ. area

(2) 12" x 6" tee sections @ 0.75 ft2 displ. area

Total duct area displaced by this burner assembly:

(3 x 0.7 ft2) + (2 x 0.75 ft2) = 3.6 ft2

Volume (CFM)

Velocity (FPM) = Net Free

Area (ft2)

The net free area of the duct, and consequently the

profile opening surrounding the burner element can

be determined by inserting the air volume and/or the

desired operating velocity into this formula. The

burner displaces area in the duct and must be added

to the air handling area to determine the appropriate

profile dimensions.

Air stream velocity and resulting static pressure

drop affect performance and are achieved by means

of a silhouette profile plate within the duct.

A minimum profile plate width of 6" is required

surrounding all LO-NOX™ Line Burner

assemblies.

Air velocity over burner

Minimum - 700 SFPM

Optimum -1500 SFPM

Maximum -3000 SFPM

NOTE: Burner is not sensitive to velocity variations

within the desired range, but NOx levels may increase

by 33% if fired at 600,000 Btu/hr, ft and at 3000

SFPM velocity.

Total heat release and LO-NOX™ Burner footage

are normally selected from the tables given in the

Series “HG” Mixing Tube section of the Maxon

catalog (Section 3200).

Nominal burner capacity

Maximum: 550,000 Btu/hr per lineal foot

(requires 12" wc mixture pressure)

Minimum: 140,000 Btu/hr per lineal foot

(requires 0.8" wc mixture pressure)

Based on information given in catalog section

3200, and within the constraints of duct size and air

volume flows, a LO-NOX™ Line Burner assembly is

designed utilizing the available sections shown on the

following pages.

When ordering a burner assembly made up from

the module components, be sure to provide an

assembly sketch of the complete burner (as viewed

from the back, or upstream, side) including locations

of all accessories and/or individual component

sections.

Page 5804 LO-NOX™ Line Burners

Design and Application Details

Manifolding and Ductwork Considerations

Manifolding and ductwork considerations are

extremely important in the design of LO-NOX™

systems. LO-NOX™ Burner systems can be

susceptible to noise generation. In order to minimize

the possibility of noise, we suggest the following:

– Adjust burner with a “fuel-lean” air/fuel ratio

– Burner element should be supported independently

from the manifolding

– No flat transitions or turns should be made in

ductwork downstream of burner

– All sheet metal ductwork should be rigidly fastened

and have adequate stiffeners attached

Burner inlet feed piping must be adequate to

provide a well-distributed flow of air/gas throughout

the burner assembly.

• Be generous with inlet sections. Use enough to

achieve a uniform mixture pressure within the

burner.

• Use more 12" -B sections, and fewer crosses

(which are most likely to generate noise problems).

• Keep manifolding symmetrical, with an extension

beyond last “take-off” of at least 2 pipe diameters in

length.

• Use flexible connectors if assembly includes more

than 2 inlet feed sections.

• Keep main header at least 36" back from burner

element to lessen chance of “shadow effect” on the

air flow across the burner.

Do not exceed the footage feed limitations shown

in the table below.

Section Description

LN = LO-NOX™ Line Burner

Mixing Plate Material

3 = #321 stainless steel

4 = #310 stainless steel

5 = Hastelloy-X

Section Code

6 = 6" straight section

12 = 12" straight section

T = 12" x 6" tee section

X = 12" x 12" cross section

12B = 12" back inlet straight section

BX = 12" x 12" back inlet cross section Number of (#30) drilled holes per lineal foot

120 = 120 holes (1.5564 in2/ft) discharge area

Example:

12" x 12" BK INLET SECTION LN 5 – BX – D – 120

Body Material

G = gray iron body

D = ductile iron body

Inlet flanges bolt directly to burner body casting

and accept threaded NPT piping. Chart above shows

maximum lineal feet of LO-NOX™ Line Burner that

may be fed by a given inlet flange.

LO-NOX™ Line Burner Designation

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LO-NOX™ Line Burners Page 5805

9/03

Fresh and recirculated air streams may be heated

with LO-NOX™ Burners supplied with a full premixture

of air and natural, propane, or butane gas.

A complete burner system to handle these

applications would include a LO-NOX™ Line Burner

assembly, Series “HG” Mixing Tube, MICRO-RATIO®

Control Valve and a combustion air blower. Your

Maxon representative can help you select from the

broad range of options available.

General Selection Procedure:

1. Calculate gross heat requirement.

2. Determine burner footage and inlet feed

requirements.

3. Enter Table 1 under column with your capacity

needs for parameters of your application.

4. Select “HG” Mixing Tube size from Table 2 based

upon the volume of air required.

Example:

– Required heat release of 7,000,000 Btu/hr

From Table 1

A. Gross heat required: 7,000,000 Btu/hr

B. = 14 ft.

C. 14 ft. x 100 SCFM/ft = 1400 SCFM primary air with

differential mixture pressure = 14" wc

From Table 2

D. Since single 8" “HG” Mixing Tube is rated for a

maximum of 2500 SCFM, this requires (1) 8" “HG”

Mixing Tube with gas orifices from Table 3.

E. Select MICRO-RATIO® Control Valve

– For 1400 SCFM air = (84,000 SCFH)

– For 7000 SCFH natural gas

(See Maxon catalog bulletin 7000)

NOTE: Select gas control valve carefully to achieve

maximum operating flexibility within its adjusting

capability. Keep control valve size small so pressure

drop through fully open valve at maximum flow

capacity is within range of controllability.

F. If available inlet gas pressure is above 10 PSIG,

consider double stage regulation to minimize

droop.

Capacity/Selection Data

LO-NOX™ Line Burners with Series “HG” Mixing Tubes

7,000,000 Btu

500,000 Btu/ft

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Page 5806 LO-NOX™ Line Burners

Envelope Dimensions (in inches)

Modular Burner Sections

6" straight

section 12" straight

section 12" x 6" tee

section 12" x 12" cross

section

Typical End Views

Tee and

Cross Sections

Straight

Sections

LO-NOX™ Line Burners Page 5807

9/03

Envelope Dimensions (in inches)

Modular Inlet Feed Burner Sections

NOTE: 12B and XB back inlet

sections must be ordered with

one of the back inlet flange

sets shown below.

)ezis(AB

288.0

5.2 52.1

45.3

)ezis(A

12" back inlet section 12" x 12"

back inlet cross

Back Inlet Flanges

Flange Sets for 12"

Back Inlet Sections Flange Sets for 12" x 12"

Back Inlet Cross Sections

Inlet flanges bolt directly to

burner casting and accept

either standard NPT or standard

ISO threaded piping of indi-

cated size.

NOTE: Refer to page 5804

for specific inlet feed capacity

limitations.

LFB 2-1/2"

LFB 3"

LFB 4"

LFB 3" 4"

Page 5808 LO-NOX™ Line Burners

Envelope Dimensions (in inches)

End Closures and End Inlet Flange Sets

NOTE: See catalog page

5804 for specific inlet

feed capacity limitations.

All open ends of a burner assembly must be closed off with one of these end closures,

or with a pilot end plate or pilot assembly as shown below and on page 5809.

Alternate

flame rod

position

2" inlet pilot set

Alternate

flame rod

position

UV scanner can be

mounted through straight-

in flame rod location. 1"

tap is bushed to 1/4" for

flame rod.

Flame rod ( if used) must be ordered separately

with all end plate and pilot sets.

Plain end

plate set

Pilot set

UV scanner can be

mounted through straight-

in flame rod location. 1"

tap is bushed to 1/4" for

flame rod.

Plain end plate

closure includes

1/8" NPT test

connection

2" inlet

set

LO-NOX™ Line Burners Page 5809

9/03

Dimensions (in inches)

Pilot Assemblies

NOTE: Order

18" long spark

electrode sub-

assembly

separately

NOTE:

Order 18"

long spark

electrode

and 24"

flame rod

sub-

assemblies

separately

AIRFLO-PAK pilot arrangements

Direct mounted version includes 14mm spark ignitor.

Order electrode separately for externally mounted

version. Order flame rod (if used) separately.

Optional air/gas pilot mixers for all LO-NOX™ pilot assemblies

Pressure type with adjustable orifice

Atmospheric type

with fixed orifice

Atmospheric type

with adjustable orifice

External Mounting Plate Assemblies as used with AIRFLO-PAK pilot assemblies

External mounting plate assembly for internal spark

ignitor & internal flame rod

External mounting plate assembly for external

UV scanner & internal spark ignitor

External mounting plate assembly for external spark

electrode & external UV scanner

External mounting plate assembly for external flame

rod & external spark ignitor

Page 5810 LO-NOX™ Line Burners

Dimensions (in inches)

External Mounting Plate Assemblies

External mounting plate details

A plate is included with all assemblies shown on

page 5809.

Mounting plate with two

(2) feed-through insula-

tors for internal mounting

of spark ignitor and flame

rod. Same size external

mounting plate used in all

assemblies shown on

page 5809.

Positioning mounting plate in relation to

LO-NOX™ Burner pilot location

Through-wall opening required

LO-NOX™ Line Burners Page 5811

9/03

Accessory Dimensions (in inches)

Profile Plate Bracket

Provides support for

profile within closed burner

loop. On some applica-

tions, it may be necessary

to restrict air flow between

adjacent burner rows to

achieve design operating

velocities. This is done by

installing customer-fabricated profile plates on profile

mounting bracket(s). See sketch 1 below for use on

square openings (formed by adjacent cross-sections

of burner). Sketch 2 applies to rectangular opening.

7-1/8"

12"

24"

Universal support bracket

Normally used in pairs as shown below. Mount to

burner assembly at any joint between sections.

Two versions available: zinc plated carbon steel for

maximum inlet temperature up to 750°F (399°C) or

#304SS for maximum inlet temperature up to 1600°F

(871°C).

Division plate

Provides isolation of burner

feed(s) where desirable.

Optional electrode cover

Protects porcelain insulator and

electrical connection from dirt

and moisture. May be used for

ambient temperatures up to

450°F (232°C).

14mm

Spark Ignitor

18"

Spark Electrode

Flame rod identification

For those burners using flame rods, most

applications are covered by one of three sizes

(specific number depends on nominal length “N” of

rod extension). These may need cut to dimension “L”

specified in tables on pages 9908 and 9908A before

use in your particular application.

Page 5812 LO-NOX™ Line Burners

Maintenance & Component Identification/Spare Parts

Item

Number

1 Burner body

2 Back up bar (straight)

3 Gasket, body (straight)

4 Back up bar (inside)

5 Gasket, inside

6 Back up bar (outside)

7 Flame protection rail (outside)

7a Flame protection rail (inside)

8 Support bracket gasket 18 GA

9 6" mixing plate

10 Corner mixing plate

12 M10 - 1.5 x 45 hex head cap screw

13 M10 - 1.5 finished hex nut

14 #10 -24 FLEX-LOK hex nut

15 #10 -24 x 1/2" indented hex head machine screw

16 #10 -24 x 2-1/4" indented hex head machine screw

17 Washer

18 #10 -24 x 3/8" indented hex head machine screw

Part Description To order replacement parts:

1. Identify specific LO-NOX™ Burner series/type

from burner assembly information plate pictured

below.

2. Provide sketch of burner arrangement, as

viewed from back (or casting side) of assembly.

For example:

3. Specify quantity of each replacement item

required from table at left.

LO-NOX™ Line Burner Information Plate

Maxon LO-NOX™ Line Burners Datasheet

Maxon LO-NOX™ Line Burners Datasheet

Maxon LO-NOX™ Line Burners Datasheet

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